The Front Range Urban Corridor is an oblong region of urban population located along the eastern face of the Southern Rocky Mountains, encompassing 18 counties in the U.S. states of Colorado and Wyoming. The corridor derives its name from the Front Range, the mountain range that defines the west central boundary of the corridor. The region comprises the northern portion of the Southern Rocky Mountain Front geographic area, which in turn comprises the southern portion of the Rocky Mountain Front geographic area of Canada and the United States. The Front Range Urban Corridor had an estimated population of 4,757,713 on July 1, 2015, an increase of +9.78% since the 2010 United States Census.